Question
The average height of 18 students is 150 cm. If x more
students join whose average height is 165 cm, the class average becomes 153 cm. Find x.Solution
ATQ, 18 * 150 + x * 165 = (18 + x) * 153 2700 + 165x = (18 + x) * 153 165x – 153x = 2754 – 2700 12x = 54 x = 4.5
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